Tread portion of an automobile tire



FIG. 1 is a perspective view of a tread portion of an automobile tire showing my design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a fragmentary enlarged front view surrounded by line 6-6 in FIG. 2;

FIG. 7 is a sectional view taken along line 7-7 in FIG. 6; and,

FIG. 8 is a reference view taken from FIG. 6 with the solid black shading used as contrast to highlight the tread grooves.

In the drawings, the broken lines defining the sidewall, inner bead and the peripheral boundary between the claimed tire tread and the unclaimed sidewall depict environmental subject matter that forms no part of the claimed design. 

CLAIM The ornamental design for a tread portion of an automobile tire, as shown and described. 